What sort of idea?
Based on the nothingness that is your question, I'd start with looking at
Google and searching for something like "
Create a windows service in C#
". I'd read the millions of tutorials that are out there talking through how to create a Windows Service.
After that I would revisit
Google and this time I would search for:
"
C# Create a Directory
"
Or I would look at visiting
Directory Class on the MSDN[
^]
Hope that helps you complete your objectives.
I would suggest you take 5 minutes and read the
Code Project Quick Answers FAQ[
^] so that you can ask better questions in future.